摘要
河道中植被的存在会影响河道的过流和挟沙能力。为了研究植被对水流的作用,在已开发的准三维浅水波运动模型控制方程中加入了杆状植被阻力项,并在绕流拖曳力系数计算中考虑了刚性植被的遮蔽效应,同时引入前人提出的植被密度的概念。对改进后的模型利用前人的实验资料进行了验证。模型对植被范围以下和以上流速垂向分布模拟效果良好。利用水箱测定了植被影响下的水流流速,结果表明植被密度是影响阻力的主要因素,而植被的排列方式影响不大;数学模型模拟植被范围和以上的水流速度及紊动能量垂向分布结果与实测值符合较好。
The existence of vegetation in river has substantial influence on the flow discharge and capacity of sediment transport.To address the effect of vegetation on flow,drag resistance terms were introduced in the shallow water equations to account for the rigid rod-shaped resistance effects based on a previously-developed quasi-3d tidal bore model.At the same time,the concept of vegetation density was introduced to account for the shading effect from vegetation.The improved model was verified by experimental data.The model has a good simulation effect for the flows in the vegetation range and thelayer beyond.The water flow velocity influenced by vegetation was measured by tests in a water tank,which shows that the density of vegetation was the main factor influencing the resistance,while the arrangement of vegetation had not that much influence.The vertical distribution of flow velocity and turbulent energy simulated by the model are basically consistent with the measured values.
作者
李绍武
涂伟伟
李明哲
LI Shao-wu;TU Wei-wei;LI Ming-zhe(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Enviromental Technology Development of TIWTE(Tianjin)Co. Ltd., Tianjin Research Institute for Water Transport Engineering,Tianjin 300456,China)
出处
《水道港口》
2022年第1期8-15,共8页
Journal of Waterway and Harbor
基金
天津市自然科学基金面上项目(18JCYBJC23900)
国家自然科学基金面上项目(51779170)
